F5 and thrombophilia: FVL mutation is a major inheritable risk factor for thrombophilia in the Western population accounting for 20% to 25% of patients with VTE.[7,8] However, the incidence of FVL has not been previously reported in Korea, Japan, or China until now.[9,10] For it had never been reported in Korea before, the Korean Society of Thrombosis and Hemostasis does not recommend routine screening of FVL for patients suspected of inherited thrombophilia.